[stubsabot] Bump pyinstaller to 6.20.*

Release: https://pypi.org/pypi/pyinstaller/6.20.0
Homepage: https://pyinstaller.org
Repository: https://github.com/pyinstaller/pyinstaller
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/pyinstaller
Diff: pyinstaller/pyinstaller@v6.19.0...v6.20.0

Stubsabot analysis of the diff between the two releases:
 - 8 public Python files have been added.
 - 0 files included in typeshed's stubs have been deleted.
 - 3 files included in typeshed's stubs have been modified or renamed: `PyInstaller/__init__.py`, `PyInstaller/building/api.py`, `PyInstaller/compat.py`.
 - Total lines of Python code added: 725.
 - Total lines of Python code deleted: 79.

If stubtest fails for this PR:
- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

Note that you will need to close and re-open the PR in order to trigger CI

Author: stubsabot

stubs/pyinstaller/METADATA.toml

@@ -1,2 +1,2 @@
-version = "6.19.*"
+version = "6.20.*"
 upstream-repository = "https://github.com/pyinstaller/pyinstaller"